SAILING TO WIN SAILING FOR LIFE Real-time weather station and GPS advancements Peter van Muyden

SAILING TO WIN SAILING FOR LIFE

Real-time weather station and GPS advancements


Peter van Muyden



PB200 WeatherStation® Instrument• True and Apparent Wind Speed and Direction• Barometric pressure• Air Temperature• Wind Chill Temperature• Heater to prevent ice build-up in wind channel• Three axis accelerometer for Pitch & Roll• GPS (WAAS / EGNOS)

• 3 axis compass with yaw rate gyro– +/- 1º for pitch and roll angles ≤ 5°– +/- 2º for pitch and roll angles ≤ 30°– +/- 3º for pitch and roll angles ≥ 30°-45°

• Both NMEA 0183/RS422 & NMEA 2000® Outputs



• Four ultrasonic transducers operate in pairs—one transducer injects a pulse into the air.

• The pulse bounces off the metal plate at the bottom of the wind channel and is carried by the wind to arrive at the listening transducer a short time later.

• When there is no wind, the pulse travels at the speed of sound from the sender to the receiver.

• Whenever the wind is blowing in that direction, the pulse will arrive sooner than if the air is still.

• Similarly, whenever the wind is blowing in the opposite direction, the pulse will arrive later than if the air is still.

Wind Calculations



• The four transducers take turns in sending and receiving pulses.

• A microprocessor within the WeatherStation then combines the measurements from all four transducers to calculate the resultant wind speed and direction.

• Throughout this process, the sensor monitors the air temperature, to compensate for the fact that the speed of sound in air changes with temperature.

Wind Calculations

receiving











or

www.jpvm.ca/WeatherStation.htm



• Remote control–Smart Phones–Tablets



Future enhancements• Match racing mark location• Upper and lower wind limits notifications



Global Positioning System (GPS)

advances



Global Positioning System (GPS)• Established in 1973 to overcome the limitations of previous navigation

systems• The first GPS satellite was launched in 1978.• A full constellation of 24 satellites was achieved in 1994.• May 2, 2000 "Selective Availability" was discontinued (this improved

accuracy from 100M to 10M)• Position calculation is based on triangulation of satellites and signal

elapsed time



GPS accuracy• 1983 +/- 100 Metres Original GPS signal• 2001 +/- 10 Metres Selective availability (SA) removed

(Bill Clinton)• 3-5 Metres: Differential GPS (DGPS) position accuracy• 2007 +/- 3 Metres Wide Area Augmentation System

(WAAS) enabled (North America)• Survey grade GPS systems +/- 1MM post propressed





When to use a GPS and when to use a compassError Accuracy

50% 1.4

Mean 1.5

RMS 1.8

95% 3.2

Max. 8.0

Distance from target Compass bearing reading error in Metres

Metres NMiles 11 22 33 44 5593 0.05 2 3 5 6 8

185 0.1 3 6 10 13 16278 0.15 5 10 15 19 24370 0.2 6 13 19 26 32463 0.25 8 16 24 32 40555 0.3 10 19 29 39 49648 0.35 11 23 34 45 57740 0.4 13 26 39 52 65833 0.45 15 29 44 58 73926 0.5 16 32 49 65 81

1018 0.55 18 36 53 71 891111 0.6 19 39 58 78 971203 0.65 21 42 63 84 1051296 0.7 23 45 68 91 1131388 0.75 24 48 73 97 1211481 0.8 26 52 78 104 1301573 0.85 27 55 82 110 1381666 0.9 29 58 87 116 1461758 0.95 31 61 92 123 1541851 1 32 65 97 129 162



Advanced GPS’s with built-in radios

•Broadcast location•Transmit Waypoints•Poll GPS location

4Mile range



Computer based course configuration

GPSLoad

Biscayne Bay



• IPAD & Android tablet users• Avionics digital charts:–North America $16–Australia / New Zealand $16



It doesn’t matter what tools you plan use, just don’t leave home without the

following:

Documents

SAILING TO WIN SAILING FOR LIFE Real-time weather station and GPS advancements Peter van Muyden